#pragma once

#include <iostream>
#include <string>
#include <strings.h>
#include <cerrno>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include<pthread.h>
#include<stdio.h>

namespace Client
{
    using namespace std;
    class UdpClient
    {
    public:
        UdpClient(const string &serverip, const uint16_t &serverport)
        :_serverIp(serverip)
        ,_serverPort(serverport)
        ,_sockfd(-1)
        ,_quit(false)
        {}

        void initClient()
        {
            _sockfd=socket(AF_INET,SOCK_DGRAM,0);
            if (_sockfd == -1)
            {
                cerr << "socket error: " << errno << " : " << strerror(errno) << endl;
                exit(2);
            }

            cout << "socket success: " << " : " << _sockfd << endl;
            // 2. client要不要bind[必须要的]，client要不要显示的bind，需不需程序员自己bind？不需要！！！
            // 写服务器的是一家公司，写client是无数家公司 -- 由OS自动形成端口进行bind！-- OS在什么时候，如何bind
        }

       static void *readMessage(void *args)
        {
            int sockfd = *(static_cast<int *>(args));
            pthread_detach(pthread_self());
            while (true)
            {
                char buffer[1024];
                struct sockaddr_in temp;
                socklen_t temp_len = sizeof(temp);
                size_t n = recvfrom(sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr *)&temp, &temp_len);
                if (n >= 0)
                    buffer[n] = 0;
                cout << buffer << endl;
            }

            return nullptr;
        }
        void run()
        {
            pthread_create(&_reader,nullptr,readMessage,(void*)&_sockfd);
            struct sockaddr_in server;
            memset(&server,0,sizeof server);
            server.sin_family = AF_INET;
            server.sin_addr.s_addr = inet_addr(_serverIp.c_str());
            server.sin_port = htons(_serverPort);


            string message;
            char cmdline[1024];
            while(!_quit)
            {
                fprintf(stdout, "Enter# ");
                fflush(stdout);
                fgets(cmdline, sizeof(cmdline), stdin);
                cmdline[strlen(cmdline)-1] = 0;
                message = cmdline;
                sendto(_sockfd, message.c_str(), message.size(), 0, (struct sockaddr *)&server, sizeof(server));
            }

        }

        ~UdpClient()
        {
        }
    private:
        int _sockfd;
        string _serverIp;
        uint16_t _serverPort;
        bool _quit;
        pthread_t _reader;
    };
}